src/schemas/schema.js

// Copyright (c) 2020 Uber Technologies, Inc.
//
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// of this software and associated documentation files (the "Software"), to deal
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// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// THE SOFTWARE.

import {console as Console} from 'global/window';

import {CURRENT_VERSION} from './versions';

/** @type {typeof import('./schema').Schema} */
export default class Schema {
  constructor({version = CURRENT_VERSION, key = '', properties = null} = {}) {
    this.version = version;
    this.properties = properties;
    this.key = key;
  }

  loadPropertiesOrApplySchema(node, parents = [], accumulator) {
    return this._getPropertyValueFromSchema('load', node, parents, accumulator);
  }

  savePropertiesOrApplySchema(node, parents = [], accumulator) {
    return this._getPropertyValueFromSchema('save', node, parents, accumulator);
  }

  _getPropertyValueFromSchema(operation, node, parents = [], accumulator) {
    const internal = `_${operation}`;
    return {
      [this.key]: this.properties
        ? Object.keys(this.properties).reduce((accu, key) => {
            return {
              ...accu,
              ...(key in node
                ? this.properties[key]
                  ? // if it's another schema
                    this.properties[key][operation]
                    ? // call save or load
                      this.properties[key][internal](node[key], [...parents, node], accu)
                    : {}
                  : {[key]: node[key]}
                : {})
            };
          }, {})
        : node
    };
  }

  _isCurrentVersion() {
    return this.version === CURRENT_VERSION;
  }

  outdatedVersionError() {
    if (!this._isCurrentVersion()) {
      Console.error(`${this.key} ${this.version} is outdated. save should not be called anymore`);
    }
  }

  _save(...args) {
    // make sure nothing is saved to an outdated version
    this.outdatedVersionError();
    return this.save(...args);
  }

  save(node, parents = [], accumulator = {}) {
    return this.savePropertiesOrApplySchema(node, parents, accumulator);
  }

  _load(...args) {
    return this.load(...args);
  }

  load(node, parents = [], accumulator = {}) {
    return this.loadPropertiesOrApplySchema(node, parents, accumulator);
  }
}